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itkObject.cxx
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itkObject.cxx
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkObject.cxx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
Portions of this code are covered under the VTK copyright.
See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#include "itkObject.h"
#include "itkObjectFactory.h"
#include "itkCommand.h"
namespace itk
{
/**
* Initialize static member that controls warning display.
*/
bool Object::m_GlobalWarningDisplay = true;
class Observer
{
public:
Observer(Command* c,
const EventObject * event,
unsigned long tag) :m_Command(c),
m_Event(event),
m_Tag(tag)
{}
virtual ~Observer()
{ delete m_Event; }
Command::Pointer m_Command;
const EventObject * m_Event;
unsigned long m_Tag;
};
class SubjectImplementation
{
public:
SubjectImplementation() {m_Count = 0;}
~SubjectImplementation();
unsigned long AddObserver(const EventObject & event, Command* cmd);
unsigned long AddObserver(const EventObject & event, Command* cmd) const;
void RemoveObserver(unsigned long tag);
void RemoveAllObservers();
void InvokeEvent( const EventObject & event, Object* self);
void InvokeEvent( const EventObject & event, const Object* self);
Command *GetCommand(unsigned long tag);
bool HasObserver(const EventObject & event) const;
bool PrintObservers(std::ostream& os, Indent indent) const;
private:
std::list<Observer* > m_Observers;
unsigned long m_Count;
};
SubjectImplementation::
~SubjectImplementation()
{
for(std::list<Observer* >::iterator i = m_Observers.begin();
i != m_Observers.end(); ++i)
{
delete (*i);
}
}
unsigned long
SubjectImplementation::
AddObserver(const EventObject & event,
Command* cmd)
{
Observer* ptr = new Observer(cmd, event.MakeObject(), m_Count);
m_Observers.push_back(ptr);
m_Count++;
return ptr->m_Tag;
}
unsigned long
SubjectImplementation::
AddObserver(const EventObject & event,
Command* cmd) const
{
Observer* ptr = new Observer(cmd, event.MakeObject(), m_Count);
SubjectImplementation * me = const_cast<SubjectImplementation *>( this );
me->m_Observers.push_back(ptr);
me->m_Count++;
return ptr->m_Tag;
}
void
SubjectImplementation::
RemoveObserver(unsigned long tag)
{
for(std::list<Observer* >::iterator i = m_Observers.begin();
i != m_Observers.end(); ++i)
{
if((*i)->m_Tag == tag)
{
delete (*i);
m_Observers.erase(i);
return;
}
}
}
void
SubjectImplementation::
RemoveAllObservers()
{
for(std::list<Observer* >::iterator i = m_Observers.begin();
i != m_Observers.end(); ++i)
{
delete (*i);
}
m_Observers.clear();
}
void
SubjectImplementation::
InvokeEvent( const EventObject & event,
Object* self)
{
for(std::list<Observer* >::iterator i = m_Observers.begin();
i != m_Observers.end(); ++i)
{
const EventObject * e = (*i)->m_Event;
if(e->CheckEvent(&event))
{
(*i)->m_Command->Execute(self, event);
}
}
}
void
SubjectImplementation::
InvokeEvent( const EventObject & event,
const Object* self)
{
for(std::list<Observer* >::iterator i = m_Observers.begin();
i != m_Observers.end(); ++i)
{
const EventObject * e = (*i)->m_Event;
if(e->CheckEvent(&event))
{
(*i)->m_Command->Execute(self, event);
}
}
}
Command*
SubjectImplementation::
GetCommand(unsigned long tag)
{
for(std::list<Observer* >::iterator i = m_Observers.begin();
i != m_Observers.end(); ++i)
{
if ( (*i)->m_Tag == tag)
{
return (*i)->m_Command;
}
}
return 0;
}
bool
SubjectImplementation::
HasObserver(const EventObject & event) const
{
for(std::list<Observer* >::const_iterator i = m_Observers.begin();
i != m_Observers.end(); ++i)
{
const EventObject * e = (*i)->m_Event;
if(e->CheckEvent(&event))
{
return true;
}
}
return false;
}
bool
SubjectImplementation::
PrintObservers(std::ostream& os, Indent indent) const
{
if(m_Observers.empty())
{
return false;
}
for(std::list<Observer* >::const_iterator i = m_Observers.begin();
i != m_Observers.end(); ++i)
{
const EventObject * e = (*i)->m_Event;
const Command* c = (*i)->m_Command;
os << indent << e->GetEventName() << "(" << c->GetNameOfClass() << ")\n";
}
return true;
}
Object::Pointer
Object::New()
{
Pointer smartPtr;
Object *rawPtr = ::itk::ObjectFactory<Object>::Create();
if(rawPtr == NULL)
{
rawPtr = new Object;
}
smartPtr = rawPtr;
rawPtr->UnRegister();
return smartPtr;
}
LightObject::Pointer
Object::CreateAnother() const
{
return Object::New().GetPointer();
}
/**
* Turn debugging output on.
*/
void
Object
::DebugOn() const
{
m_Debug = true;
}
/**
* Turn debugging output off.
*/
void
Object
::DebugOff() const
{
m_Debug = false;
}
/**
* Get the value of the debug flag.
*/
bool
Object
::GetDebug() const
{
return m_Debug;
}
/**
* Set the value of the debug flag. A non-zero value turns debugging on.
*/
void
Object
::SetDebug(bool debugFlag) const
{
m_Debug = debugFlag;
}
/**
* Return the modification for this object.
*/
unsigned long
Object
::GetMTime() const
{
return m_MTime.GetMTime();
}
/**
* Make sure this object's modified time is greater than all others.
*/
void
Object
::Modified() const
{
m_MTime.Modified();
InvokeEvent( ModifiedEvent() );
}
/**
* Increase the reference count (mark as used by another object).
*/
void
Object
::Register() const
{
itkDebugMacro(<< "Registered, "
<< "ReferenceCount = " << (m_ReferenceCount+1));
// call the parent
Superclass::Register();
}
/**
* Decrease the reference count (release by another object).
*/
void
Object
::UnRegister() const
{
// call the parent
itkDebugMacro(<< "UnRegistered, "
<< "ReferenceCount = " << (m_ReferenceCount-1));
if ( (m_ReferenceCount-1) <= 0)
{
/**
* If there is a delete method, invoke it.
*/
this->InvokeEvent(DeleteEvent());
}
Superclass::UnRegister();
}
/**
* Sets the reference count (use with care)
*/
void
Object
::SetReferenceCount(int ref)
{
itkDebugMacro(<< "Reference Count set to " << ref);
// ReferenceCount in now unlocked. We may have a race condition to
// to delete the object.
if( ref <= 0 )
{
/**
* If there is a delete method, invoke it.
*/
this->InvokeEvent(DeleteEvent());
}
Superclass::SetReferenceCount(ref);
}
/**
* Set the value of the global debug output control flag.
*/
void
Object
::SetGlobalWarningDisplay(bool val)
{
m_GlobalWarningDisplay = val;
}
/**
* Get the value of the global debug output control flag.
*/
bool
Object
::GetGlobalWarningDisplay()
{
return m_GlobalWarningDisplay;
}
unsigned long
Object
::AddObserver(const EventObject & event, Command *cmd)
{
if (!this->m_SubjectImplementation)
{
this->m_SubjectImplementation = new SubjectImplementation;
}
return this->m_SubjectImplementation->AddObserver(event,cmd);
}
unsigned long
Object
::AddObserver(const EventObject & event, Command *cmd) const
{
if (!this->m_SubjectImplementation)
{
Self * me = const_cast<Self *>( this );
me->m_SubjectImplementation = new SubjectImplementation;
}
return this->m_SubjectImplementation->AddObserver(event,cmd);
}
Command*
Object
::GetCommand(unsigned long tag)
{
if (this->m_SubjectImplementation)
{
return this->m_SubjectImplementation->GetCommand(tag);
}
return NULL;
}
void
Object
::RemoveObserver(unsigned long tag)
{
if (this->m_SubjectImplementation)
{
this->m_SubjectImplementation->RemoveObserver(tag);
}
}
void
Object
::RemoveAllObservers()
{
if (this->m_SubjectImplementation)
{
this->m_SubjectImplementation->RemoveAllObservers();
}
}
void
Object
::InvokeEvent( const EventObject & event )
{
if (this->m_SubjectImplementation)
{
this->m_SubjectImplementation->InvokeEvent(event,this);
}
}
void
Object
::InvokeEvent( const EventObject & event ) const
{
if (this->m_SubjectImplementation)
{
this->m_SubjectImplementation->InvokeEvent(event,this);
}
}
bool
Object
::HasObserver( const EventObject & event ) const
{
if (this->m_SubjectImplementation)
{
return this->m_SubjectImplementation->HasObserver(event);
}
return false;
}
bool
Object
::PrintObservers(std::ostream& os, Indent indent) const
{
if (this->m_SubjectImplementation)
{
return this->m_SubjectImplementation->PrintObservers(os, indent);
}
return false;
}
/**
* Create an object with Debug turned off and modified time initialized
* to the most recently modified object.
*/
Object
::Object():
LightObject(),
m_Debug(false),
m_SubjectImplementation(NULL),
m_MetaDataDictionary(NULL)
{
this->Modified();
}
Object
::~Object()
{
itkDebugMacro(<< "Destructing!");
delete m_SubjectImplementation;
delete m_MetaDataDictionary;//Deleting a NULL pointer does nothing.
}
/**
* Chaining method to print an object's instance variables, as well as
* its superclasses.
*/
void
Object
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Modified Time: " << this->GetMTime() << std::endl;
os << indent << "Debug: " << (m_Debug ? "On\n" : "Off\n");
os << indent << "Observers: \n";
if(!this->PrintObservers(os, indent.GetNextIndent()))
{
os << indent.GetNextIndent() << "none\n";
}
}
MetaDataDictionary &
Object
::GetMetaDataDictionary(void)
{
if(m_MetaDataDictionary==NULL)
{
m_MetaDataDictionary=new MetaDataDictionary;
}
return *m_MetaDataDictionary;
}
const MetaDataDictionary &
Object
::GetMetaDataDictionary(void) const
{
if(m_MetaDataDictionary==NULL)
{
m_MetaDataDictionary=new MetaDataDictionary;
}
return *m_MetaDataDictionary;
}
void
Object
::SetMetaDataDictionary(const MetaDataDictionary & rhs)
{
if(m_MetaDataDictionary==NULL)
{
m_MetaDataDictionary=new MetaDataDictionary;
}
*m_MetaDataDictionary=rhs;
}
} // end namespace itk